Editorial note — Chapter IV · Physical Exercise.

Note. “In early boyhood and youth nothing can replace the active sports so much enjoyed at this period; and while no needless restrictions should be placed upon them, consideration should be paid to the amount, and especially to the character, of the games pursued by delicate youth. For these it would be better to develop the weakened parts by means of systematic physical exercises and by lighter sports.”—Dr. John M. Keating on “Physical Development” in Pepper’s Cyclopædia of the Diseases of Children.